Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Escrow Balance Related to Purchase of Goldline) (Details)

v3.19.2
Commitments and Contingencies (Escrow Balance Related to Purchase of Goldline) (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
AMST | Goldline, LLC  
Long-term Purchase Commitment [Line Items]  
Escrow deposit $ 750